<?php
require 'vendor/autoload.php';

$typeMap = [
    'array' => 'array',
    'document' => 'MongoDB\Model\BSONDocument',
    'root' => 'MongoDB\Model\BSONDocument'
];

$mongo = new MongoDB\Client('mongodb://localhost:27017/');

$collection = $mongo->selectCollection('demo', 'users');

$query = [
    'UserUuid' => '47f4b337-cd9d-446a-b030-c311e534e94a'
];

$document = $collection->findOne($query, ['typeMap' => $typeMap]);

if (null === $document)
{
    echo "Nothing was found.\n";
}
else
{
    var_dump($document);
}